1) Separate out CONSTRAINT types
2) Filter both source and dest pads/vias for drilled holes when doing
hole-to-hole checks. We were checking the items being put into the
DRC RTree, but not the items we were scanning.
3) Add hole clearance to Board Setup Constraints panel.
Fixes https://gitlab.com/kicad/code/kicad/issues/6546
Fixes https://gitlab.com/kicad/code/kicad/issues/4683
Improves implicit rule reporting.
Makes some internal names more consistent.
Moves DRC_REPORT to the test framework.
Removes priority (which isn't supported in the grammar)
- convert expression string tokens to single-quote-delimited
- fix bug where netclass assignments weren't getting updated after
board setup dialog
- move property manager rebuild to lazy evaluation
- improve performance with wider use of const&
- retire DRC_SELECTOR stuff
- use wxString for GUI stuff (particularly translated stuff)
- fix EqualTo() to return false instead of asserting when op types
don't match
- fix buffer overruns with fixed-size string buffers
- make expression function calls case-insensitive
- integrate expression errors into rule parser
- produce more and better error messages
- keep BOARD_ITEM ptrs const as long as possible
- fix a couple of uninitialized variables